examples: add python+dbus example to print active access point

examples/python/dbus/wifi-active-ap.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Copyright (C) 2015 Red Hat, Inc.
+#
+
+#
+# This example starts or stops a wifi hotspot
+#
+# Configuration settings are described at
+# https://developer.gnome.org/NetworkManager/1.0/ref-settings.html
+#
+
+import dbus, sys, time
+
+bus = dbus.SystemBus()
+service_name = "org.freedesktop.NetworkManager"
+proxy = bus.get_object(service_name, "/org/freedesktop/NetworkManager/Settings")
+settings = dbus.Interface(proxy, "org.freedesktop.NetworkManager.Settings")
+
+if len(sys.argv) != 2:
+    print "Usage: %s <ifname>" % sys.argv[0]
+    sys.exit(0)
+
+# Get the device object path based on interface name
+iface = sys.argv[1]
+proxy = bus.get_object(service_name, "/org/freedesktop/NetworkManager")
+nm = dbus.Interface(proxy, "org.freedesktop.NetworkManager")
+devpath = nm.GetDeviceByIpIface(iface)
+
+# Get a proxy to the wifi device and get the active access point's object path
+proxy = bus.get_object(service_name, devpath)
+props = dbus.Interface(proxy, "org.freedesktop.DBus.Properties")
+active_ap_path = props.Get("org.freedesktop.NetworkManager.Device.Wireless", "ActiveAccessPoint")
+if active_ap_path == "/":
+    print "%s is not currently associated" % sys.argv[1]
+    sys.exit(0)
+
+# Get the active access point's SSID and BSSID
+ap_proxy = bus.get_object(service_name, active_ap_path)
+ap_props = dbus.Interface(ap_proxy, "org.freedesktop.DBus.Properties")
+raw_ssid = ap_props.Get("org.freedesktop.NetworkManager.AccessPoint", "Ssid")
+bssid = ap_props.Get("org.freedesktop.NetworkManager.AccessPoint", "HwAddress")
+
+# Convert the SSID from a byte array to a string, assuming ASCII encoding
+ssid = ""
+for c in raw_ssid:
+    ssid = ssid + chr(c)
+
+print "%s is associated to '%s' (%s)" % (sys.argv[1], ssid, bssid)
+
+sys.exit(0)
+